Portable telephone



FIG. 1 is an upper front perspective view of a portable telephone showing my new design with the antenna extended;

FIG. 2 is a front view;

FIG. 3 is a side view;

FIG. 4 is a rear view;

FIG. 5 is a side view taken in the direction of arrow 5 in FIG. 1;

FIG. 6 is an upper plan view;

FIG. 7 is a bottom plan view. 

The ornamental design for a portable telephone, as shown and described. 